Typewriting machine



W. F. HELMOND.

TYPEWRITING MACHINE. APPLICATION FILED JUNE 13. 1919.

1,41 1,024, Patented Ma r. 28, 1922.

K L, W71 W W WILM F. HEL'MOND, 0F HARTFORD, C TYPEWRITER COMPANY, 015 NEW YORK QNNEUTICUT, ASSIGNOR T0 UNDERWQGD N. 2., A CORPQRATION OF rrrnwnrrrne neon.

ilAtllfl @241.

To all whom it may concern:

Be it known that ll, WILLIAM F. HEL- MOND, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Type writing Machines, of which the following is a Specification.

This invention relates to the means whereby the type-keys efi'ect letter-feeding movements of the carriages of typewriting machines, and, as claimed herein, has principallyto do with the escapement mechanism, and particularly with the mounting of the escapement wheel.

The features of the invention disclosed herein relating mor particularly to the im-,

proved construction and mounting of the universal bar which transmits the movements of the keys to theletter-feeding dogs, and the improvements in means whereby the type-bars of the machine may be inserted and removed, are not claimed herein, and these features have been made-the subject of a divisional application, Serial No. 371,- 312, filed April 5, 1920.

Typewriters ar manufactured with a variety of styles of types, some type faces being small and requiring fine letter-feeding movements of the carriage, and other type faces being large and requiring greater lettor-feeding movements. Accordingly, the carriage escapement wheel may be provided with any appropriate number of teeth. It is sometimes desired to increase or diminish the extent of letter-feeding movement of the carriage, and for this purpose another escapement Wheel must be substituted, and it is one of the objects of the invention to facilitate such substitution, and make the escapement wheel readily detachable from and replaceable in the machine. According to the present improvements, the escapement wheel is mounted upon a ball bearing in such a manner that the wheel, the ball bearing and the usual pinion form a unit, which may be manufactured separately and set in place upon th machine. There are two sets of bearing balls running in ball cups formed in the ends of a removable bushing, and cones for the balls are mounted upon a tube which is headed to retain the cones. This tube is carried by an axle which also carries Specification of Letters Patent.

Application filed June 13, 1913. Serial Ito.

Patented Mar. as, rose.

the pinion, the latter oo'nnected by the usual pawls to the escapement wheel, the axle being readily removable from the tube.

Other features and advantages will herematter appear. 1 I

In the accompanying drawings,

Figure l is a central sectional side view of an Underwood typewriting machine, illustrating the present improvements.

Figure 2 shows part of the devices seen at Figure l, and illustrates the method of removing a type-bar from the machine.

Figur 3 is an enlarged detail of a conical pivot and a fitting therefor in the arm of a universal bar frame.

Figure 4: is a perspective view of the dogrocker.

Figure 5 is an enlarged view of a stopscrew, seen at Figure a, for arresting the stepping dog,

Figure 6 illustrates details of a stop-lever which is movable to permit the operation seen in Figure 2.

Figure 7 is an enlarged perspective view of a conical pivot for the rocking frame which carries the universal bar, showing the arbor or mount for said pivot and its adust ng head and locking pin.

Figure 8 is a rear View of the escapement Wheel and the escapement mechanism.

Figure 9 is a sectional view, taken about centrally of Figure 8.

Figure 10 shows details of the escapement whee and its axle.

Keys 20 depress levers 21 to operate bellcranks 22 to swing type-bars 23 up against the front of a platen 24, as is common in the Underwood machine; said platen being mounted 'upon a carriage 25 running on tracks 26, 27. A carriage rack 28 meshes with a pinion 29 that is connected to an escapement wheel 30, for controlling the letter feeding movements of the carriage, the latter being driven by a spring barrel 31 under control of the escapement wheel. The movements of the escapement member or wheel are controlled by a rocker 32, having a rigid detent dog 33 and a pivoted stepping dog 34,

the latter normally meshing with the wheel and being held by a fixed stop formed on the dog-rocker 32; and movements are imparted to the dog rocker by a striker 35, which is carried by a frame 36, the latter comprising bar segment displace one side of the rocking a universal bar 37, operable by heels 38 upon the type-bars. The universal bar 37 is concentric with the wire 39, upon which the type-bars are shown as pivoted.

At the depression of any key, its bellcrank 22 is operated, and the type-bar 23 swung up to the printing point, pressing back the universal bar 37 and frame 36, and by means of the striker pressing the dog rocker back, so that the stepping dog 34 thereon escapes from the wheel 30, and the rigid detent dog 33 is carried into mesh with the wheel. The dog 34 is swung by a spring to a point opposite the next notch in the escapement wheel 30. Upon relief of the key from pressure, it is returned by a spring 41: the type-bar returns to normal position, and the universal bar is returned by a spring 42. The spring 40, which is connected to the stepping dog 34 and to a stationary frame part of the machine, as is shown most clearly in Figure 1, operates also to return the dog rocker to the normal Figure 1 position.

The ribbon vibrator comprises a lever 43 engaged by an actuator 44, which is mounted upon the universal bar frame 36. The lever is connected to vibrate a ribbon carrier 45, as usual in the Underwood typewriter.

This universal bar frame 36 has at its rear ends opposite arms 46, 47, Which are pivoted upon upright guide arms 48,49; the frame 36 being guided at its front end in the usual manner by a tongue working in the type- '51. These arms rise from a rock shaft 52, which is pivoted between uprights 53, 54, forming part of a general framework for the escapement mechanism,

The desired alignment of the universal bar 37 is obtained by providing for bodily adjustment of the rocking guide frame 48, 49, 52. To this end, the rocking frame is mounted upon pivots 55, 56, which are relatively adjustable laterally in frame either forwardly or backwardly' of the machine.

the form of a screw having a conical point, whioh'fits in a bearing in one end of the shaft 52; the arbor or mount 56 having a conical point 57, which fits in a similar bearing in t e opposite end of the rock shaft 52. The pivot 55 may be stationary, except that it may be shifted endwise to adjust or take up play of the rock shaft 52; but the pivot point 57 is adjustable forwardly and backwardly; the arbor 56 being for this purpose mounted eccentrically of the pivot point 57 The pivot 57 should be at its topmost position, as in Figure 9, and may be secured against rotative displacement by a lock'ng pin 58, which may enter an of several notches 59. in a head 60 provide upon the arbor or shaft 56; said pin fixed at 61 in the casting 54. If,however, the universal bar 37 should be found to opera manner tov7 5 against a stop pin 7 5*.

ate differently at one end from the other,

this difficulty can be corrected, by first tak ing out the arbor or shaft 56 and turning it so as to shift the p-'vot 57 either forwardly or backwardly, and then restoring said arbor, thereby displacing this end of the rocking frame 48, 49, 52, and hence swinging the frame 36 and universal bar 37 horizontally until the front or active edge of said universal bar is exactly parallel with the plane of the pivot wire 39; the pin 58 now occupying another notch 59, to re-lock the arbor 56 against 62 mayalso be rovided for the pivot or eccentric 56, to hold it where adjusted endwise in connection with the opposite pivot 55. It thus becomes practicable andsimple to secure accuracy of movement not only of the ribbon-vibrator, but also of the feed-dogs.

The arms 48, 49 may be provided with gudgeons or pivots, one of which, 63, is threaded so as to be adjustable, and is secured by a set screw 64 and cone-pointed at 65, Figure 3, to fit in a conical hole 66, made in the arm 46. and the pivot 63 screwed out to take up the shake, and the screw 64 then tightened. arm 49 is forced a companion pivot or gudgeon 63, to fit in a conical hole made in arm 47. This construction permits the pivo shaft to be dispensed with, which usually extends from arm 46 to arm 47 and renders the feeding dogs inaccessible.

The detent dog 33 and the stepping dog 34 are carried upon the rocker 32. Said rocker may be journaled upon' adjustable pivots 67 secured by set screws 68 The universal-bar frame striker 35 engages the end of a screw 69, which is threaded into the upper portion of the dog rocker 32; the screw being adjustable to secure fine variations in the timing of the rocker action. The dog rocker is returned by the spring 40 to normal position, the lower end of the rocker engaging the head of a stop screw threaded into theframework. At its lower end, therocker also carries an adjustable screw 71, which strikes against a stop 72 to The screw 64 may be loosened,

limit the initial movement of the rocker.

This stop 72 is pivoted upon a screw 73, and has a handle 74, whereby it may be swung out of the path of the screw 71, to permit additional movement of the dog rocker and universal-bar frame 36 when it is desired to detach any type-bar from the machine, Figure 2, said stop 72 being returned by a spring A back-check pawl 75" is also pivoted upon the dog rocker.

The spring 40 not only returns the dog rocker, but also vibrates the stepping dog 34 when the latter escapes from a tooth of the escapement wheel 30. The stepping movement of the stepping'do is limited by the tapered or bevele face 0 a cone-headed adstop is .The bushing 93 may be emma jnstable screw 76. This adjustable screw laced directly upon the dog rocker 32, so t at it becomes shifted together with said rocker whenever the pivot pins 67 are re-adjusted, so that the re-adjusting of said pins 67 does not make it necessary separately to re-adj-ust the screw 76. Moreover, this screw stop can be placed near to the pivot of the stepping dog 34, thus decreasing the noise of operation. Also, by reason of the fact that the cone-headed dog-adjusting stop-screw 76 is threaded ,into the dOg rocker 32 from the back thereof, parallel to the pivotal-axis of the stepping dog 34, with its head end exposed at the rear of the machine, as clearly appears in Figure 8, this screw is at all times accessible for adjustment, thereby to vary the forward throw of the stepping dog 34 when this dog is released from the escapement wheel 30.

The escapement wheel 30 is journaled in a boss 77- at the top of "the fixed frame 53, 54. In a bearing opening in said boss is remova-bly fitted a bushing 93, in the ends of which are formed cups 78 for two rows or sets of bearing balls 79. Cones 80 and 81 co-operate with the cups 78 to form raceways for the sets of balls. These cones are mounted upon a tube 82, which at its inner end is headed at 83, and at its outer end is turned outwardly or rolled over at 84, to confine the outer cone 80 against the balls; 2. space 85 being left between the cones to permit them to be drawn together to compensate for wear. The tube 82 may fit tightly but removably upon an axle 86; and a screw 87 threaded into the outer or rear end of said axle may clamp a plate or washer 88 against the end of the tubular retainer 82, holding the same against the face of the wheel 30,

and also drawing a shoulder formed by an enlarged portion 89 of the axle against the front face of the wheel. This enlarged portion 89 serves as a bearing or pivot for the pinion 29, which is confined thereon by the head of ascrew 91 threaded into the end of the axle part 89. The usual pawls 92 are pivoted upon the face of the wheel, and form a clutching device to engage thepinion 29, which is loose upon the bearing 89. It will be seen that the escapement wheel and pinion may be manufactured as a unit, together with the pawls, the axle, and the bushing 93 having the other ball-bearing parts therein. removably retained in place by a set screw 94. By removing the screw 91 the pinion 29 may be readily withdrawn and another one substituted. The shaft 86, 89 may be readily detached, leaving the bushing 93 and other parts of the ballbearing in the machine. The escapement wheel 30 may be removed by removing either the axle 86 or the bushing 93 together with the parts carried thereby.

Variations may be resorted to withm the bushing,

scope of the invention, and portions of the im rovements may be used without others.

aving thus described my invention, I claim:

1. The combination of an escapementwheel, and a ball-bearing device for said escapement wheel, said parts forming a unlt, the ball-bearing device comprising a bushing, cones co-operating with the bushing, bearing balls interposed between the cones and the bushing, and a tube .on which said cones are mounted, said tube being headed over the cones.

2. The combination of an escapement wheel, and a ball-bearing device for said escapement wheel, said parts forming a unit, the ballbearing device comprising a bushing, cones co-operating with the bushing, bearing balls interposed between the cones and the bushing, a tube on which said cones are mounted, said tube being headed over the cones, and a detachable wheel axle on which said tube is mounted.

3. The combination of an escapement wheel, and a ball-bearing device for said escapement wheel, said parts forming a unit, the ball-bearing device comprising a bushing, cones co-operating with the bushing, bearing balls interposed between the cones and the bushing, a tube on which said cones are mounted, said tube being headed over the cones, a Wheel axle on which said tube is mounted, and means on the end of said axle for confining the. cones.

4:. The combination of an escapement wheel, a relatively movable pinion, a clutching device between the escapement wheel and the pinion, and a detachable ball-bearing device for said escapement'wheel, said parts forming a unit.

5. The combination of an escapement wheel, a relatively movable pinion, a clutching device between the escapement wheel and the pinion, a detachable ball-bearing device for said escapement wheel, said parts forming a unit, the ball-bearing device comp-rising a bushing, cones co-operating with the and bearing balls interposed between the cones and the bushing.

6. The combination of an escapement wheel, a relatively movable pinion, a clutching device between the escapement wheel and the pinion, a detachable ball-bearing device for said escapement wheel, said parts forming a unit, the ball-bearing device comp-ris-. ing a bushing, cones co-operating with the bushing bearing balls interposed between the cones and the bushing, and a tube'on which said cones are mounted, said tube being headed over the cones.

7. The combination of an escapement Wheel, a relatively movable pinion, a clutch-- ing device between the escapement wheel and the pinion, a detachable ball-bearing device for said escapement wheel, said parts formv the pinion,

, said cones are having an enlargement ing a unit, the ball-bearing device comprising a bushing, cones co-operating with the bushing, bearing balls interposed between the cones and the bushing, a tube on which mounted, said tube being headed over the cones, a wheel axle on which said tube is mounted, and meanson the end of said axle for confining the cones.

8. The combination of an escapement wheel, a relatively movable pinion, a clutching device between the escapement wheel and a detachable ball-bearing device for said escapement wheel, said parts forming a unit, the-ball-bearing device comprisa bushing, cones co-operating with the bushing, bearing balls interposed between the cones and the bushing, a tube on which said cones are mounted, said tube being headed over the cones, a wheel axle on which said tube is mounted, and means on the end of said axle for confining the cones, said axle having an enlargement forming, a pivot for said pinion.

9. The combination of an escapement wheel, a relatively movable pinion, a clutching device between the escapement wheel and the pinion, a detachable ball-bearing device for said escapement wheel, said parts forming a unit, the ball-bearing device comprising a bushing, cones co-operating with the bushing, bearing balls interposed between the cones and the bushing, a tube on which said cones are mounted, said tube being headed over the cones, a wheel axle on which said tube is mounted, means on the end of said axle for confining the cones, said axle forming a pivot for said pinion, and means upon the end of said enlargement for confining said pinion.

10. In atypewriting machine, an escapement wheel, a ball-bearing equipment therefor comprising a bushing removably inserted in a bearing in the framework, cones cooperating with terposed between I unitary the bushing, bearing balls interposed between the cones and the'bushing, and meansfor confining said cones to said escapement wheel; the wheel, cones, balls and bushing forming a unit from and attachable to the machine.

11. In a typewriting machine, an escapement wheel, a ball-bearing equipment therefor comprising a bushingremovably inserted in a bearing in the framework, cones cooperating with the bushing, bearing balls inthe cones and the bushing, means for confining said cones to said escapement wheel; the wheel, cones, balls and bushing forming a unit detachable from and attachable to the machine, and a pinion mounted upon said unit-and having a. clutch connection to said wheel; said pinion being detachable from said unit.

12. In a typewriting machine, an escapement wheel, a ball-bearing equipment therefor comprising a bushing removably inserted in a bearing in the framework, cones cooperating with the bushing, bearing balls interposed between the cones and the bush ing, means including a detachable shaft for confining said cones to said escapement wheel; the wheel, shaft, cones, balls and bushing forming a unit detachable from and attachable to the machine," and a pinion mounted upon said unit and having a connection to said wheel, said pinion being detachable from said unit.

13. In a typewriting machine, in combination, a framework provided with an opening forming a supporting bearing, a detachable anti-friction bearing device removably insertable in said bearing opening, an escapement wheel, and a detachable axle for the escapement wheel removably insertable in said bearin device.

WILLIAM F. ELMOND. Witnesses:

GEORGE H. VARNEY, WILLIAM P. SMITH.

detachable 

